Mute Signal Circuit between Navigation Receiver Assembly and Stereo Component Amplifier [08/2015 - ]: Procedure

1. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L31-1 (MUTE) - Body ground	Power switch on (ACC) Audio system playing → Audio system changing modes	2.0 V or higher → Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Stereo Component Amplifier Assembly)

NG → Refer to   2 

OK → Refer to   5 

1. Disconnect the L38 navigation receiver assembly connector.
2. Disconnect the L31 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L38-16 (MUT1) - L31-1 (MUTE)	Always	Below 1 Ω
   L38-16 (MUT1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the L38 navigation receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L38-16 (MUT1) - Body ground	Power switch on (ACC) Audio system playing	2.0 V or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Navigation Receiver Assembly)

NG → Refer to   4 

OK → Refer to   6